ARM: OMAP2+: AM33xx: hwmod: add missing HWMOD_NO_IDLEST flags

struct omap_hwmod records belonging to wkup m3 domain is missing
HWMOD_NO_IDLEST flags; add them.

This patch is a prerequisite for a subsequent patch, 'ARM: OMAP2:
am33xx-hwmod: Fix "register offset NULL check" bug'.  That patch would
otherwise attempt to read from reserved bits.

Signed-off-by: Hebbar Gururaja <gururaja.hebbar@ti.com>
[paul@pwsan.com: add some more explanation in the patch description]
Signed-off-by: Paul Walmsley <paul@pwsan.com>