ARM: OMAP2+: Mark omap_hsmmc_init and omap_mux related functions as __init

Now that omap hsmmc init is split into two functions, it's safe
to mark omap_hsmmc_init and omap_mux related functions to __init.

This basically reverts the following fixes for the case where
TWL was compiled as a module:

a98f77b (ARM: omap: fix section mismatch warning for sdp3430_twl_gpio_setup())
8930b4e (ARM: omap: fix section mismatch warnings in mux.c caused by hsmmc.c)

Additionally it fixes up the remaining section warnings for
all callers of omap_mux functions.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/board-flash.c b/arch/arm/mach-omap2/board-flash.c
index 30a6f52..0349fd2 100644
--- a/arch/arm/mach-omap2/board-flash.c
+++ b/arch/arm/mach-omap2/board-flash.c
@@ -189,7 +189,7 @@
  *
  * @return - void.
  */
-void board_flash_init(struct flash_partitions partition_info[],
+void __init board_flash_init(struct flash_partitions partition_info[],
 			char chip_sel_board[][GPMC_CS_NUM], int nand_type)
 {
 	u8		cs = 0;