usb: gadget: f_fs: Update driver to handle compat id descriptors

Extended compat ID descriptor contains fixed-length header section and
one or more function section. Function section contains five fields as:
bFirstInterfaceNumber, Reserved1, compatibleID, subCompatibleID and
Reserved2. Specification suggests that Reserved1 needs to be set as 0x1
but f_fs driver fails processing descriptors if Reserved1 field is 0x1.
This results into USB enumeration issue due to incomplete descriptors.

This issue is seen with newer adbd which is passing extended compat ID
descriptors.

CRs-Fixed: 994161
Change-Id: Id18261d76edd859ef078f4510dd82b8a6c1ca4bd
Signed-off-by: Mayank Rana <mrana@codeaurora.org>