bnxt_en: Add functions to copy host context memory

bnxt_en: Add functions to copy host context memory

Host context memory is used by the newer chips to store context
information for various L2 and RoCE states and FW logs.  This
information will be useful for debugging.  This patch adds the
functions to copy all pages of a context memory type to a contiguous
buffer.  The next patches will include the context memory dump
during ethtool -w coredump.

Reviewed-by: Pavan Chebbi <[email protected]>
Reviewed-by: Hongguang Gao <[email protected]>
Co-developed-by: Shruti Parab <[email protected]>
Signed-off-by: Shruti Parab <[email protected]>
Signed-off-by: Sreekanth Reddy <[email protected]>
Signed-off-by: Michael Chan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>