Merge pull request #171 in PROCESSOR-SDK/processor-sdk-linux from plsdk-2750 to processor-sdk-linux-4.19.y
* commit '3c4238882bee4590cb0b6d69c3ee4f96ad7efd38':
net: ethernet: ti: ptp_bc: make pps_mux_sel gpios optional
net: ethernet: ti: cpts: enhance pps gen/latch operations
arm: dts: am57[1,2,4]x-idk-pps: break timers into pps_timer and latch_timer
arm: dts: am57[1,2,4]x-idk-pps: use PIN_OUTPUT_PULLDOWN for off state
dt-bindings: net : ptp_bc: Document optional parameter pps-sel[0,1]-gpios
dt-bindings: net: ti-prueth: Document the optional pinctrl parameters for SYNC/LATCH signal
dt-bindings: net: cpsw: document PPS related optional parameters