cpucache_invalidate: use bx reg instead of mov pc, reg to return

Using BX has the effect to set the T bit, so it can return to a thumb
function

With this change, rockbox runs fine on Clipv2 built with -mthumb (for
most files which don't use inline 32 bits ARM assembly)

Some other places use code which change the T bit on armv5 but not on
armv4 so armv4 won't run

See FS#6734

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26386 a1c6a512-1295-4272-9138-f99709370657

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