ARM: 8924/1: tcm: make dtcm_end and itcm_end static

The dtcm_end and itcm_end are not exported or used
elsewhere, so make them static to remove the following
sparse warnign:

arch/arm/kernel/tcm.c:33:5: warning: symbol 'dtcm_end' was not declared. Should it be static?
arch/arm/kernel/tcm.c:34:5: warning: symbol 'itcm_end' was not declared. Should it be static?
Signed-off-by: NBen Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>

arch/arm/kernel/tcm.c

@@ -30,8 +30,8 @@ extern char __itcm_start, __sitcm_text, __eitcm_text;
 extern char __dtcm_start, __sdtcm_data, __edtcm_data;
 
 /* These will be increased as we run */
-u32 dtcm_end = DTCM_OFFSET;
-u32 itcm_end = ITCM_OFFSET;
+static u32 dtcm_end = DTCM_OFFSET;
+static u32 itcm_end = ITCM_OFFSET;
 
 /*
  * TCM memory resources