posix: profiles: make POSIX_AEP_CHOICE_ZEPHYR the default

Default POSIX_AEP_CHOICE to POSIX_AEP_CHOICE_ZEPHYR

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

Author: cfriedt

lib/posix/Kconfig.profile

@@ -20,7 +20,7 @@ config POSIX_API
 
 choice POSIX_AEP_CHOICE
 	prompt "POSIX Subprofile"
-	default POSIX_AEP_CHOICE_NONE
+	default POSIX_AEP_CHOICE_ZEPHYR
 	help
 	  This choice is intended to help users select the correct POSIX profile for their
 	  application. Choices are based on IEEE 1003.13-2003 (now inactive / reserved) and