powerpc: Remove unused REDBOOT Kconfig parameter

This removes the REDBOOT Kconfig parameter,
which was no longer used anywhere in the source code
and Makefiles.

Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index ba4730b..f0a8931 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -209,9 +209,6 @@
 	  Used to allow a board to specify it wants a uImage built by default
 	default n
 
-config REDBOOT
-	bool
-
 config ARCH_HIBERNATION_POSSIBLE
 	bool
 	default y
diff --git a/arch/powerpc/platforms/83xx/Kconfig b/arch/powerpc/platforms/83xx/Kconfig
index 670a033..2bdc8c8 100644
--- a/arch/powerpc/platforms/83xx/Kconfig
+++ b/arch/powerpc/platforms/83xx/Kconfig
@@ -99,7 +99,6 @@
 config ASP834x
 	bool "Analogue & Micro ASP 834x"
 	select PPC_MPC834x
-	select REDBOOT
 	help
 	  This enables support for the Analogue & Micro ASP 83xx
 	  board.
diff --git a/arch/powerpc/platforms/8xx/Kconfig b/arch/powerpc/platforms/8xx/Kconfig
index 8dec3c0..bd6f1a1 100644
--- a/arch/powerpc/platforms/8xx/Kconfig
+++ b/arch/powerpc/platforms/8xx/Kconfig
@@ -45,7 +45,6 @@
 config PPC_ADDER875
 	bool "Analogue & Micro Adder 875"
 	select CPM1
-	select REDBOOT
 	help
 	  This enables support for the Analogue & Micro Adder 875
 	  board.