mediatek: remove duplicate RPS patch

mediatek: remove duplicate RPS patch

Commit 7af1fb9faafb ("kernel: add a RPS balancer") introduces a RPS balancer
for all targets.

In the past however, this patch was already introduced for target "mediatek"
in commit 7762c07c8898 ("mediatek: bump to v4.14")

Remove the separate copy of the patch within the mediatek target,
which otherwise is applied twice and results in a build error.

Fixes: 7af1fb9faafb ("kernel: add a RPS balancer")
Signed-off-by: Koen Vandeputte <[email protected]>
(backported from 23366b6dc6bb81c9c0e0bd7c91832a5bf0e5dbc2)