[POWERPC] Fix CPM2 SCC1 clock initialization.

A missing break statement in a switch caused cpm2_clk_setup() to initialize
SCC2 instead of SCC1.
Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/cpm2.c

@@ -240,6 +240,7 @@ int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 	case CPM_CLK_SCC1:
 		reg = &im_cpmux->cmx_scr;
 		shift = 24;
+		break;
 	case CPM_CLK_SCC2:
 		reg = &im_cpmux->cmx_scr;
 		shift = 16;