gve: Do minor cleanup and bump version

This commit fixes several minor issues:

• Removes an unnecessary function pointer parameter on gve_start_tx_ring
• Adds a presubmit check against style(9)
• Replaces mb() and rmb() macros with native atomic_thread_fence_seq_cst() and atomic_thread_fence_acq() respectively
• Fixes various typos throughout
• Increments the version number to 1.3.2

Co-authored-by: Vee Agarwal <veethebee@google.com>
Signed-off-by: Vee Agarwal <veethebee@google.com>
Signed-off-by: Jasper Tran O'Leary <jtranoleary@google.com>

Reviewed by: delphij, markj
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D48969