OMAP: Clean up Menelaus driver and add VIO and VMEM support

Add support for enabling/disabling VIO and VMEM. Implement
proper locking. Clean up code.
Signed-off-by: Samuel Ortiz <samuel.ortiz@solidboot.com>
Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>

include/asm-arm/arch-omap/menelaus.h

@@ -7,10 +7,13 @@
 #ifndef __ASM_ARCH_MENELAUS_H
 #define __ASM_ARCH_MENELAUS_H
 
-extern void menelaus_mmc_register(void (*callback)(unsigned long data, u8 card_mask),
+extern int menelaus_mmc_register(void (*callback)(unsigned long data, u8 card_mask),
 				  unsigned long data);
-extern void menelaus_mmc_remove(void);
-extern void menelaus_mmc_opendrain(int enable);
+extern int menelaus_mmc_remove(void);
+extern int menelaus_mmc_opendrain(int enable);
+
+extern int menelaus_set_vmem(unsigned int mV);
+extern int menelaus_set_vio(unsigned int mV);
 
 #if defined(CONFIG_ARCH_OMAP24XX) && defined(CONFIG_MENELAUS)
 #define omap_has_menelaus()	1