ARM: dts: msm: support qseecom bus scaling for apq8074-v2.2

To support qseecom bus scaling, ab & ib values are changed to set four
bandwidth levels: "INACTIVE, LOW, MEDIUM and HIGH" with corresponding
bus bandwidth of {0M, 0M, 150M, 492M}; and the flag of support-bus-scaling
is also set for apq8074-v2.2.

Change-Id: Ie31ca0d121d1dae67cfbf141424a59f832727288
Signed-off-by: Zhen Kong <zkong@codeaurora.org>