OMAP2xxx: clock: fix low-frequency oscillator clock rate

The OMAP2420/2430 external 32-kHz low-frequency oscillator is a 32768
Hz oscillator, not a 32,000 Hz oscillator[1][2].  Fix this in the clock
tree.
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1. OMAP2420/22 Multimedia Processor Data Manual, Version P [SWPS019P],
   section 5.1.4 "External 32-kHz CMOS Clock" (note that it refers to
   a "32.768-kHz" clock; this presumably should be "32.768-KHz")

2. OMAP2430 Multimedia Processor ES2.1 Data Manual, Version V [SWPS023V],
   section 5.1.4 "External 32-kHz CMOS Clock" (note that it refers to
   a "32.768-kHz" clock; this presumably should be "32.768-KHz")

arch/arm/mach-omap2/clock2420_data.c

@@ -55,7 +55,7 @@
 static struct clk func_32k_ck = {
 	.name		= "func_32k_ck",
 	.ops		= &clkops_null,
-	.rate		= 32000,
+	.rate		= 32768,
 	.clkdm_name	= "wkup_clkdm",
 };
 

arch/arm/mach-omap2/clock2430_data.c

@@ -55,7 +55,7 @@
 static struct clk func_32k_ck = {
 	.name		= "func_32k_ck",
 	.ops		= &clkops_null,
-	.rate		= 32000,
+	.rate		= 32768,
 	.clkdm_name	= "wkup_clkdm",
 };