ARM: OMAP2+: Fix typo in sdrc.h

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/sdrc.h

@@ -176,7 +176,7 @@ u32 omap2xxx_sdrc_reprogram(u32 level, u32 force);
  * will not be met. Setting all parameters for complete worst case may work,
  * but may cut memory performance by 2x. Due to errata the DLLs need to be
  * unlocked and their value needs run time calibration. A dynamic call is
- * need for that as no single right value exists acorss production samples.
+ * need for that as no single right value exists across production samples.
  *
  * Only the FULL speed values are given. Current code is such that rate
  * changes must be made at DPLLoutx2. The actual value adjustment for low