ARM: dts: msm: Disable AHB2AHB bypass mode for msm8926 target

With AHB2AHB bypass mode enable, USB core depends on PNOC
frequency and it is required to be fixed while USB is active.
Hence, voting for max PNOC freq, which trigger device going
into turbo. To avoid device going into turbo and to eliminate
the dependency with PNOC freq, disabling the AHB2AHB bypass,
so that USB core depends on its own USB system clock.

Change-Id: I84283c692a602b8ed46ab66c34adffd608fb54c8
Signed-off-by: ChandanaKishori Chiluveru <cchilu@codeaurora.org>