[OSCBS-41] Update to Zephyr v3.2.0 (#382)

Updating to integrate with Zephyr v3.2.0 required:

- Update `west.yml` to import Zephyr v3.2.0 manifest
- Prefix include pathname of ztest.h with `zephyr/`
- Prefix every Zephyr header included pathname with `zephyr/`
- Change all Zephyr tests/samples to use `find_package`
- For unit_testing, use a distinct prj.conf which only references
  Kconfigs defined in the Zephyr repo. (Zephyr constraint.)
- Move ztest headers into a zephyr-prefixed pathname

Co-authored-by: Gregory Shue <gregory.shue@legrand.com>

test/ztest/include/zephyr/sys/printk.h

@@ -0,0 +1,77 @@
+/* printk.h - low-level debug output */
+
+/*
+ * Copyright (c) 2010-2012, 2014 Wind River Systems, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Modified from zephyr_v2.2.0 include/sys/printk.h
+ * because:
+ *   1. This port will never be run in the Zephyr kernel.
+ *      This repository is extended to be a Zephyr module for that.
+ *
+ * Modifications:
+ *   a. Code conditionally compiled on the following CPP symbols were deleted
+ *      (as they were kernel-specific):
+ *        CONFIG_PRINTK
+ *        KERNEL
+ *   b. Inclusion of The following header files were removed as irrelevant.
+ *        <toolchain.h>
+ *        <inttypes.h>
+ */
+#ifndef ZEPHYR_INCLUDE_SYS_PRINTK_H_
+#define ZEPHYR_INCLUDE_SYS_PRINTK_H_
+
+#include <stddef.h>
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *
+ * @brief Print kernel debugging message.
+ *
+ * This routine prints a kernel debugging message to the system console.
+ * Output is send immediately, without any mutual exclusion or buffering.
+ *
+ * A basic set of conversion specifier characters are supported:
+ *   - signed decimal: \%d, \%i
+ *   - unsigned decimal: \%u
+ *   - unsigned hexadecimal: \%x (\%X is treated as \%x)
+ *   - pointer: \%p
+ *   - string: \%s
+ *   - character: \%c
+ *   - percent: \%\%
+ *
+ * Field width (with or without leading zeroes) is supported.
+ * Length attributes h, hh, l, ll and z are supported. However, integral
+ * values with %lld and %lli are only printed if they fit in a long
+ * otherwise 'ERR' is printed. Full 64-bit values may be printed with %llx.
+ * Flags and precision attributes are not supported.
+ *
+ * @param fmt Format string.
+ * @param ... Optional list of format arguments.
+ *
+ * @return N/A
+ */
+
+extern void printk(const char *fmt, ...);
+extern void vprintk(const char *fmt, va_list ap);
+
+//GAS: useful? #warning "z_vprintk is not supported in this port of ztest"
+static inline void z_vprintk(int (*out)(int f, void *c), void *ctx,
+					 const char *fmt, va_list ap)
+{
+	(void)(out);
+	(void)(ctx);
+	(void)(fmt);
+	(void)(ap);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif