UDC: Dm-Bow failed to load when size is not Multiple of 4096

BUG : 240098675

Skip Dm-Bow load incase size is not a Multiple of 4096.
Rounding down does not hurt, since ext4 will only use full blocks

Change-Id: Ie4e6634b2c49762e4669e66d94effc91d8e581ca
Signed-off-by: Swapneel Mashalkar <quic_smashalk@quicinc.com>