bnxt: fix bnxt_hwrm_fw_set_time for y2038

bnxt: fix bnxt_hwrm_fw_set_time for y2038

Orabug: 27648355, 27648339

On 32-bit architectures, rtc_time_to_tm() returns incorrect results
in 2038 or later, and do_gettimeofday() is broken for the same reason.

This changes the code to use ktime_get_real_seconds() and time64_to_tm()
instead, both of them are 2038-safe, and we can also get rid of the
CONFIG_RTC_LIB dependency that way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 7dfaa7bc99498da1c6c4a48bee8d2d5265161a8c)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>