partial omap2430 fixes for musb_hdrc

Partial build fixes for musb_hdrc on OMAP 2430; plus typedef and CaMeLcAsE
removal in the support for Mentor's DMA engine.

Also re-order the mach-omap2 Kconfig to restore the option hierachy that
was destroyed when the 2430SDP patch was merged into the wrong place.

Someone still needs to provide <asm/arch/hdrc_cnf.h> corresponding to
how the Mentor core is configured on that platform; add some register
and pin mux declarations; and create and register the platform_device.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>