ARM: dts: msm: Modify num ports for BIMC and MNOC slaves for msm8994

Modify the number of ports on the DDR slave and MNOC BIMC gateway slave
to two. This could have led to bus driver calculating higher bus
frequency.

Change-Id: I63b634dd7c3f1cadc7007fd08fb69b4596721385
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>