net/bnxt: add index opcode and operand to mapper table

net/bnxt: add index opcode and operand to mapper table

Extended the regfile and computed field operations to a common
index opcode operation and added globlal resource operations are
also part of the index opcode operation.

Signed-off-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>