Config.in: add BR2_PIC_PIE_ARCH_SUPPORTS hidden option

The nios2 architecture is already excluded from PIC/PIE due to issues,
and we're going to also exclude Microblaze, so let's introduce a
BR2_PIC_PIE_ARCH_SUPPORTS hidden boolean to facilitate adding this new
architecture exclusion.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 70dd4bd156bac2bde07751dc3c4d5da9b14d7d7c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Config.in

@@ -713,10 +713,15 @@ endmenu
 
 comment "Security Hardening Options"
 
-config BR2_PIC_PIE
-	bool "Build code with PIC/PIE"
+config BR2_PIC_PIE_ARCH_SUPPORTS
+	bool
+	default y
 	# Nios2 toolchains produce non working binaries with -fPIC
 	depends on !BR2_nios2
+
+config BR2_PIC_PIE
+	bool "Build code with PIC/PIE"
+	depends on BR2_PIC_PIE_ARCH_SUPPORTS
 	depends on BR2_SHARED_LIBS
 	depends on BR2_TOOLCHAIN_SUPPORTS_PIE
 	help
@@ -724,7 +729,7 @@ config BR2_PIC_PIE
 	  Position-Independent Executables (PIE).
 
 comment "PIC/PIE needs a toolchain w/ PIE"
-	depends on !BR2_nios2
+	depends on BR2_PIC_PIE_ARCH_SUPPORTS
 	depends on BR2_SHARED_LIBS
 	depends on !BR2_TOOLCHAIN_SUPPORTS_PIE
 
@@ -811,7 +816,7 @@ config BR2_RELRO_PARTIAL
 
 config BR2_RELRO_FULL
 	bool "Full"
-	depends on !BR2_nios2 # BR2_PIC_PIE
+	depends on BR2_PIC_PIE_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_SUPPORTS_PIE
 	select BR2_PIC_PIE
 	help
@@ -820,7 +825,7 @@ config BR2_RELRO_FULL
 	  program loading, i.e every time an executable is started.
 
 comment "RELRO Full needs a toolchain w/ PIE"
-	depends on !BR2_nios2
+	depends on BR2_PIC_PIE_ARCH_SUPPORTS
 	depends on !BR2_TOOLCHAIN_SUPPORTS_PIE
 
 endchoice