nb/intel/sandybridge/raminit: Fix non ASCII char

Change-Id: I3f0869dc0b72bef7da8313c69da4fe2a63761ad9
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/27633
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/sandybridge/raminit_common.c

@@ -265,7 +265,7 @@ void dram_timing_regs(ramctr_timing *ctrl)
 		dram_odt_stretch(ctrl, channel);
 
 		/*
-		 * TC—Refresh timing parameters
+		 * TC-Refresh timing parameters
 		 * The tREFIx9 field should be programmed to minimum of
 		 * 8.9*tREFI (to allow for possible delays from ZQ or
 		 * isoc) and tRASmax (70us) divided by 1024.