POST: switch CFG_POST_OCM with CFG_POST_CODEC (workaround)

Switch the OCM testid with the codec one. The reason is that current
implementation requires the POST_ROM testid to fit into lower 16
bits, and the codec test will never run with POST_ROM hopefully.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>

include/post.h

@@ -94,7 +94,7 @@ extern int post_hotkeys_pressed(void);
 #define CFG_POST_SPR		0x00000400
 #define CFG_POST_SYSMON		0x00000800
 #define CFG_POST_DSP		0x00001000
-#define CFG_POST_CODEC		0x00002000
+#define CFG_POST_OCM		0x00002000
 #define CFG_POST_FPU		0x00004000
 #define CFG_POST_ECC		0x00008000
 #define CFG_POST_BSPEC1		0x00010000
@@ -102,7 +102,7 @@ extern int post_hotkeys_pressed(void);
 #define CFG_POST_BSPEC3		0x00040000
 #define CFG_POST_BSPEC4		0x00080000
 #define CFG_POST_BSPEC5		0x00100000
-#define CFG_POST_OCM		0x00200000
+#define CFG_POST_CODEC		0x00200000
 
 #endif /* CONFIG_POST */