picolibc: Remove lite-exit and atomic-signal configs

1. lite-exit is used by default and removed in the latest
   Picolibc.
2. atomic-signal is removed in the latest Picolibc. It
   will be always turned on.

Signed-off-by: Yuriy Kolerov <[email protected]>

Author: kolerov

Makefile.in

@@ -951,10 +951,8 @@ PICOLIBC_COMMON_CONFIGURE_OPTIONS := \
 	-Dincludedir=include \
 	-Dsystem-libc=true \
 	-Dposix-console=true \
-	-Dlite-exit=true \
 	-Dnewlib-obsolete-math=false \
 	-Dwant-math-errno=true \
-	-Datomic-signal=false \
 	-Dassert-verbose=true \
 	-Ddebug=true \
 	-Dwerror=true