Kconfig: Remove redundant variable sets

In a few places we have Kconfig entries that set SPL_LDSCRIPT to what is
the default value anyways.  Drop these.

Cc: Michal Simek <monstr@monstr.eu>
Cc: Rick Chen <rick@andestech.com>
Cc: Philippe Reynes <tremyfr@yahoo.fr>
Cc: Eric Jarrige <eric.jarrige@armadeus.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com> (for Microblaze)
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>

arch/microblaze/Kconfig

@@ -30,7 +30,4 @@ config STACK_SIZE
 
 source "board/xilinx/microblaze-generic/Kconfig"
 
-config SPL_LDSCRIPT
-	default "arch/microblaze/cpu/u-boot-spl.lds"
-
 endmenu

arch/riscv/Kconfig

@@ -229,7 +229,4 @@ config STACK_SIZE_SHIFT
 	int
 	default 14
 
-config SPL_LDSCRIPT
-	default "arch/riscv/cpu/u-boot-spl.lds"
-
 endmenu

board/armadeus/apf27/Kconfig

@@ -1,8 +1,5 @@
 if TARGET_APF27
 
-config SPL_LDSCRIPT
-	default "arch/$(ARCH)/cpu/u-boot-spl.lds"
-
 config SYS_BOARD
 	default "apf27"