mlxbf-bootctl: correctly identify secure boot with development keys

The secure boot state of the BlueField SoC is represented by two bits:
                0 = production state
                1 = secure boot enabled
                2 = non-secure (secure boot disabled)
                3 = RMA state
There is also a single bit to indicate whether production keys or
development keys are being used when secure boot is enabled.
This single bit (specified by MLXBF_BOOTCTL_SB_DEV_MASK) only has
meaning if secure boot state equals 1 (secure boot enabled).

The secure boot states are as follows:
- “GA secured” is when secure boot is enabled with official production keys.
- “Secured (development)” is when secure boot is enabled with development keys.

Without this fix “GA Secured” is displayed on development cards which is
misleading. This patch updates the logic in "lifecycle_state_show()" to
handle the case where the SoC is configured for secure boot and is using
development keys.

Fixes: 79e29cb8

 ("platform/mellanox: Add bootctl driver for Mellanox BlueField Soc")
Reviewed-by: Khalil Blaiech <kblaiech@nvidia.com>
Signed-off-by: David Thompson <davthompson@nvidia.com>
Link: https://lore.kernel.org/r/20231130183515.17214-1-davthompson@nvidia.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>