Kconfig: Remove CONFIG_SYS_SRAM_START

Remove ad-hoc CONFIG_SYS_SRAM_START and use CONFIG_SYS_SRAM_BASE instead.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
diff --git a/Kconfig b/Kconfig
index 583d39d..372425e 100644
--- a/Kconfig
+++ b/Kconfig
@@ -393,6 +393,8 @@
 config SYS_SRAM_BASE
 	hex
 	default 0x80000000 if TARGET_PIC32MZDASK
+	default 0x40200000 if TARGET_DEVKIT8000
+	default 0x40200000 if TARGET_TRICORDER
 	default 0x0
 
 config SYS_SRAM_SIZE