ARM: OMAP2+: Fix l4ls clk domain handling in STANDBY

ARM: OMAP2+: Fix l4ls clk domain handling in STANDBY

[ Upstream commit 47fe74098f3dadba2f9cc1e507d813a4aa93f5f3 ]

Don't put the l4ls clk domain to sleep in case of standby.
Since CM3 PM FW[1](ti-v4.1.y) doesn't wake-up/enable the l4ls clk domain
upon wake-up, CM3 PM FW fails to wake-up the MPU.

[1] https://git.ti.com/cgit/processor-firmware/ti-amx3-cm3-pm-firmware/

Signed-off-by: Sukrut Bellary <sbellary@baylibre.com>
Tested-by: Judith Mendez <jm@ti.com>
Link: https://lore.kernel.org/r/20250318230042.3138542-2-sbellary@baylibre.com
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>