omap2_clk_fixed_enable() was checking the wrong bit to determine if
the 54MHz APLL was ready, causing a "Clock apll54_ck didn't enable in
100000 tries" warning message on 2430SDP:
Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com>