Kconfig: Remove unneeded UDELAY_IO redeclaration

UDELAY_IO is defined in src/cpu/x86/Kconfig, so it does
not need to be redefined in the AMD cpu or board Kconfigs.

Change-Id: I6676881c0ba5d1634230fc3d3c37da3afbc6fceb
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/13780
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/amd/agesa/Kconfig

@@ -34,10 +34,6 @@ config CPU_AMD_AGESA
 
 if CPU_AMD_AGESA
 
-config UDELAY_IO
-	bool
-	default n
-
 config XIP_ROM_SIZE
 	hex
 	default 0x100000