bnxt_en: Retrieve maximum of 128 APP TLVs

It appears that the maximum number of APP TLVs supported by the hardware
is 128 according to D45005. Well Daniel Porsch reported an issue PR284073
which shows that the number can exceed the limit, causing out of bound
write to on-stack allocated variable app[128] and the kernel panics.

Limit to 128 while retrieving APP TLVs.

PR: 284073
Reviewed by: markj
Tested by: Daniel Porsch <daniel.porsch@loopia.se>
Fixes: 35b53f8c989f bnxt_en: Add PFC, ETS & App TLVs protocols support
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D48589