arch/arm/include/asm/arch-omap5/clocks.h: Fix GCC 4.2 warnings

Fix:
clocks.c: In function 'setup_post_dividers':
clocks.c:175: warning: comparison is always true due to limited range of
data type
clocks.c:177: warning: comparison is always true due to limited range of
data type
clocks.c:179: warning: comparison is always true due to limited range of
data type
clocks.c:181: warning: comparison is always true due to limited range of
data type
clocks.c:183: warning: comparison is always true due to limited range of
data type
clocks.c:185: warning: comparison is always true due to limited range of
data type
clocks.c:187: warning: comparison is always true due to limited range of
data type
clocks.c:189: warning: comparison is always true due to limited range of
data type

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: sricharan <r.sricharan@ti.com>
Cc: Tom Rini <trini@ti.com>
diff --git a/arch/arm/include/asm/arch-omap5/clocks.h b/arch/arm/include/asm/arch-omap5/clocks.h
index fa99f65..d0e6dd6 100644
--- a/arch/arm/include/asm/arch-omap5/clocks.h
+++ b/arch/arm/include/asm/arch-omap5/clocks.h
@@ -686,14 +686,14 @@
 struct dpll_params {
 	u32 m;
 	u32 n;
-	u8 m2;
-	u8 m3;
-	u8 h11;
-	u8 h12;
-	u8 h13;
-	u8 h14;
-	u8 h22;
-	u8 h23;
+	s8 m2;
+	s8 m3;
+	s8 h11;
+	s8 h12;
+	s8 h13;
+	s8 h14;
+	s8 h22;
+	s8 h23;
 };
 
 extern struct omap5_prcm_regs *const prcm;