msm: 8974: Add SPI Ethernet device for 8974 CDP

Add the device definitions, GPIO settings, and clock table
entries needed to support SPI Ethernet on MSM8974 CDP.

Change-Id: I2d09eef6ddbc601cd0fb678e4d6a4050a22858a8
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>