OMAP: powerdomain: split pwrdm_init() into two functions

In preparation for OMAP_CHIP() removal, split pwrdm_init() into three
functions.  This allows some of them to be called multiple times: for
example, pwrdm_register_pwrdms() can be called once to register
powerdomains that are common to a group of SoCs, and once to register
powerdomains that are specific to a single SoC.

The appropriate order to call these functions - which is enforced
by the code - is:

1. pwrdm_register_platform_funcs()
2. pwrdm_register_pwrdms() (can be called multiple times)
3. pwrdm_complete_init()

Convert the OMAP2, 3, and 4 powerdomain init code to use these new
functions.

While here, improve documentation, and increase CodingStyle
conformance by shortening some local variable names.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/powerdomains2xxx_data.c

@@ -119,5 +119,7 @@ static struct powerdomain *powerdomains_omap2xxx[] __initdata = {
 
 void __init omap2xxx_powerdomains_init(void)
 {
-	pwrdm_init(powerdomains_omap2xxx, &omap2_pwrdm_operations);
+	pwrdm_register_platform_funcs(&omap2_pwrdm_operations);
+	pwrdm_register_pwrdms(powerdomains_omap2xxx);
+	pwrdm_complete_init();
 }