msm: kgsl: Remove unused L2PC PM QoS feature

KGSL already has PM QoS covering what matters. The L2PC PM QoS code is
not only unneeded, but also unused, so remove it. It's poorly designed
anyway since it uses a timeout with PM QoS, which is drastically bad for
power consumption.

Change-Id: I5d10e07bab90bbd916b65022c66e1b3a7b20a42f
[@0ctobot: Remove unused variable 'cpu' (4903:6)]
Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
Signed-off-by: Panchajanya1999 <panchajanya@azure-dev.live>
Signed-off-by: K A R T H I K <karthik.lal558@gmail.com>
(cherry picked from commit 56be96930e22b408bf17a12837bc651993981736)

Author: Demon000

drivers/gpu/msm/adreno.c

@@ -1013,11 +1013,6 @@ static int adreno_of_get_power(struct adreno_device *adreno_dev,
 		&device->pwrctrl.pm_qos_active_latency))
 		device->pwrctrl.pm_qos_active_latency = 1000;
 
-	/* get pm-qos-cpu-mask-latency, set it to default if not found */
-	if (of_property_read_u32(node, "qcom,l2pc-cpu-mask-latency",
-		&device->pwrctrl.pm_qos_cpu_mask_latency))
-		device->pwrctrl.pm_qos_cpu_mask_latency = 1000;
-
 	/* get pm-qos-wakeup-latency, set it to default if not found */
 	if (of_property_read_u32(node, "qcom,pm-qos-wakeup-latency",
 		&device->pwrctrl.pm_qos_wakeup_latency))