Add back the llvm-ar P flag

The P flag is supported as of llvm r354044, add back the flag to reduce
the size of intermediate archieve files. This does not affect the final
binaries.

Test: build
Bug: 71618641
Change-Id: I4021aec783ba341768893392b73b976c1fa5bdf7
diff --git a/core/combo/select.mk b/core/combo/select.mk
index eab4c72..33c8e6d 100644
--- a/core/combo/select.mk
+++ b/core/combo/select.mk
@@ -28,7 +28,7 @@
 
 # Set reasonable defaults for the various variables
 
-$(combo_var_prefix)GLOBAL_ARFLAGS := cqsD -format=gnu
+$(combo_var_prefix)GLOBAL_ARFLAGS := crsPD -format=gnu
 
 $(combo_var_prefix)STATIC_LIB_SUFFIX := .a