sparc: Implement ARCH_HAS_CC_CAN_LINK

The generic CC_CAN_LINK detection does not work for all architectures.

Make the logic easier to understand and allow the simplification of the
generic CC_CAN_LINK by using a tailored implementation.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>

Author: t-8ch

arch/sparc/Kconfig

@@ -13,6 +13,7 @@ config 64BIT
 config SPARC
 	bool
 	default y
+	select ARCH_HAS_CC_CAN_LINK
 	select ARCH_HAS_CPU_CACHE_ALIASING
 	select ARCH_HAS_DMA_OPS
 	select ARCH_MIGHT_HAVE_PC_PARPORT if SPARC64 && PCI
@@ -475,4 +476,14 @@ config COMPAT
 	select ARCH_WANT_OLD_COMPAT_IPC
 	select COMPAT_OLD_SIGACTION
 
+config ARCH_CC_CAN_LINK
+	bool
+	default $(cc_can_link_user,-m64) if 64BIT
+	default $(cc_can_link_user,-m32)
+
+config ARCH_USERFLAGS
+	string
+	default "-m64" if 64BIT
+	default "-m32"
+
 source "drivers/sbus/char/Kconfig"