libc: use the common libc time() implementation for most libcs

Use the implementation of time() from the common libc, since there
it no longer pulls in POSIX.

Use is implied for minimal, newlib, and picolibc, and selected
for IAR.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>

lib/libc/Kconfig

@@ -84,6 +84,7 @@ config MINIMAL_LIBC
 	imply COMMON_LIBC_MALLOC
 	imply COMMON_LIBC_CALLOC
 	imply COMMON_LIBC_REALLOCARRAY
+	imply COMMON_LIBC_TIME
 	help
 	  Build with minimal C library.
 
@@ -96,6 +97,7 @@ config PICOLIBC
 	select TC_PROVIDES_POSIX_C_LANG_SUPPORT_R
 	imply COMMON_LIBC_MALLOC
 	imply COMMON_LIBC_ABORT
+	imply COMMON_LIBC_TIME
 	depends on PICOLIBC_SUPPORTED
 	help
 	  Build with picolibc library. The picolibc library is built as
@@ -116,6 +118,7 @@ config NEWLIB_LIBC
 	imply POSIX_FILE_SYSTEM_ALIAS_FSTAT
 	imply POSIX_MULTI_PROCESS_ALIAS_GETPID
 	imply POSIX_SIGNALS_ALIAS_KILL
+	imply COMMON_LIBC_TIME
 	help
 	  Build with newlib library. The newlib library is expected to be
 	  part of the SDK in this case.
@@ -137,7 +140,7 @@ config IAR_LIBC
 	depends on IAR_LIBC_SUPPORTED
 	depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "iar"
 	select COMMON_LIBC_STRNLEN
-	select COMMON_LIBC_TIME if POSIX_TIMERS
+	select COMMON_LIBC_TIME
 	help
 	  Use the full IAR Compiler runtime libraries.
 	  A reduced Zephyr minimal libc will be used for library functionality