Some fixes to dspic, fpga, and gdc post tests for lwmon5. Disable external watch-dog for now.

Signed-off-by: Dmitry Rakhchev <rda@emcraft.com>
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
diff --git a/post/board/lwmon5/gdc.c b/post/board/lwmon5/gdc.c
index 42da370..73d5935 100644
--- a/post/board/lwmon5/gdc.c
+++ b/post/board/lwmon5/gdc.c
@@ -35,7 +35,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#define GDC_SCRATCH_REG 0xC1FF8044
+#define GDC_SCRATCH_REG 0xC1FF8008
 #define GDC_VERSION_REG 0xC1FF8084
 #define GDC_RAM_START   0xC0000000
 #define GDC_RAM_END     0xC2000000