transfer_to_handler_cont: is now just a blr.

Directly perform blr in power_save_ppc32_restore().

Also remove useless setting of r11 in e500 version of
power_save_ppc32_restore().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e337506e08a4df95b11d2290104b92f0dcdb5548.1615552867.git.christophe.leroy@csgroup.eu