mxs: Convert sys_proto.h prefixes to 'mxs'

The sys_proto.h functions (except the boot modes) are compatible with
i.MX233 and i.MX28 so we use 'mxs' prefix for its methods.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/arch/arm/cpu/arm926ejs/mxs/timer.c b/arch/arm/cpu/arm926ejs/mxs/timer.c
index c4b0f5e..4ed75e6 100644
--- a/arch/arm/cpu/arm926ejs/mxs/timer.c
+++ b/arch/arm/cpu/arm926ejs/mxs/timer.c
@@ -66,7 +66,7 @@
 		(struct mxs_timrot_regs *)MXS_TIMROT_BASE;
 
 	/* Reset Timers and Rotary Encoder module */
-	mx28_reset_block(&timrot_regs->hw_timrot_rotctrl_reg);
+	mxs_reset_block(&timrot_regs->hw_timrot_rotctrl_reg);
 
 	/* Set fixed_count to 0 */
 	writel(0, &timrot_regs->hw_timrot_fixed_count0);