firmware: ti_sci: Use the non-atomic bitmap API when applicable

Usages of the 'res_map' bitmap is protected with a spinlock, so non-atomic
functions can be used to set/clear bits.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/fb7edc555b6fa7c74707f13e422196693a834bc8.1657308216.git.christophe.jaillet@wanadoo.fr