ena: Add reset reason for corrupted RX cdescs

RX completion descriptors may sometimes contain errors due
to corruption. Upon identifying such a case, the driver will
trigger a reset with an explicit reset reason
ENA_REGS_RESET_RX_DESCRIPTOR_MALFORMED.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit 4af71159db3cd4a37055b2b3d982ec53703c5c3d)