net: ena: enable support of rss hash key and function changes

net: ena: enable support of rss hash key and function changes

Add the rss_configurable_function_key bit to driver_supported_feature.

This bit tells the device that the driver in question supports the
retrieving and updating of RSS function and hash key, and therefore
the device should allow RSS function and key manipulation.

This commit turns on  device support for hash key and RSS function
management. Without this commit this feature is turned off at the
device and appears to the user as unsupported.

This commit concludes the following series of already merged commits:
commit f70a73267e1a ("net: ena: changes to RSS hash key allocation")
commit c74cff8c258f ("net: ena: change default RSS hash function to Toeplitz")
commit 0714685d8bef ("net: ena: allow setting the hash function without changing the key")
commit df0e56757a42 ("net: ena: fix error returning in ena_com_get_hash_function()")
commit 1440b397c0e5 ("net: ena: avoid unnecessary admin command when RSS function set fails")
commit fd9716306798 ("net: ena: rss: do not allocate key when not supported")
commit f8cfbd755ad6 ("net: ena: fix incorrect default RSS key")

The above commits represent the last part of the implementation of
this feature, and with them merged the feature can be enabled
in the device.

Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>