mtd: nand: Confine MTD_NAND_SH_FLCTL to SUPERH

As of commit a521422e ("ARM: shmobile: mackerel: Remove Legacy C
board code"), the Renesas SuperH FLCTL driver is no longer used on ARM
SH-Mobile SoCs. Restrict the dependencies, unless compile-testing.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/Kconfig

@@ -480,7 +480,7 @@ config MTD_NAND_MXC
 
 config MTD_NAND_SH_FLCTL
 	tristate "Support for NAND on Renesas SuperH FLCTL"
-	depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
+	depends on SUPERH || COMPILE_TEST
 	depends on HAS_IOMEM
 	depends on HAS_DMA
 	help