[PATCH] powerpc: Cleanup hvc_rtas.c a little

A few cleanups in hvc_rtas.c:
 1. Remove unused RTASCONS_PUT_ATTEMPTS
 2. Remove unused rtascons_put_delay.
 3. Use i as a loop counter like everyone else on earth.
 4. Remove pointless variables, eg. x = foo; if (x) return something_else;
 5. Whitespace cleanups and formatting.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>