rk: add and fix PIE support

1) PIE depends on GENERIC_ALLOCATOR
2) fix old version objcopy -j do not support wildcard
3) add rockchip PIE section group

arch/arm/kernel/pie.lds.S

@@ -23,6 +23,7 @@ SECTIONS
 
 	PIE_OVERLAY_START
 	OVERLAY : NOCROSSREFS {
+		PIE_OVERLAY_SECTION(rockchip)
 	}
 	PIE_OVERLAY_SEND
 

lib/Kconfig

@@ -345,6 +345,7 @@ config HAVE_PIE
 config PIE
 	bool "Embedded position independant executables"
 	depends on HAVE_PIE
+	select GENERIC_ALLOCATOR
 	help
 	  This option adds support for embedding position indepentant (PIE)
 	  executables into the kernel. The PIEs can then be copied into

pie/Makefile

@@ -62,6 +62,8 @@ $(obj)/pie_stage2.o: $(obj)/pie_stage1.o $(obj)/libpie_stage2.o
 
 # Drop everything but the pie sections
 OBJCOPYFLAGS_pie_stage3.o += -j ".pie.*"
+OBJCOPYFLAGS_pie_stage3.o += -j ".pie.text"
+OBJCOPYFLAGS_pie_stage3.o += -j ".pie.rockchip.text" -j ".pie.rockchip.data"
 
 $(obj)/pie_stage3.o: $(obj)/pie_stage2.o
 	$(call if_changed,objcopy)