esp_hosted_ng: Fix Bluetooth build failure on if HCI_PRIMARY is not defined

esp_hosted_ng: Fix Bluetooth build failure on if HCI_PRIMARY is not defined

After Linux commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=84a4bb6548a29326564f0e659fb8064503ecc1c7
BT_HS has been removed and consequently AMP controllers can't be created,
so at this point only HCI_PRIMARY has been left as unique controller type
to be created and this became implicit with no need to define if the
controller if HCI_PRIMARY or HCI_AMP. So let's assign HCI_PRIMARY only if
it's defined, otherwise do nothing.

Signed-off-by: Giulio Benetti <[email protected]>
Signed-off-by: Shreyas Sheth <[email protected]>