BoardConfigCommon: Remove BOARD_BLUETOOTH_USES_HCIATTACH_PROPERTY flag

Pyramid doesn't have this flag.
bluetooth: vnd_msm8660: Update configuration from HTC Pyramid

Signed-off-by: Sultanxda <sultanxda@gmail.com>
msm8660: set UMS dirty ratio to 50

Change-Id: I8528056b3a35ac6e11ab8242955fc49aec510754