data-kernel: emac: reduce the rw operation to 200ms

fix to reduce MDIO delay in read and write operation in phy regs of
the emac driver.

Change-Id: I559c4ee00da57547113b83fd980803a4b19b5c03
Acked-by: Abhishek Chauhan <abchauha@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>