drm/amd/display: Increase block_sequence array size

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Increase block_sequence array size

[Why]

It's possible to generate more than 50 steps in hwss_build_fast_sequence,

for example with a 6-pipe asic where all pipes are in one MPC chain. This

overflows the block_sequence buffer and corrupts block_sequence_steps,

causing a crash.

[How]

Expand block_sequence to 100 items. A naive upper bound on the possible

number of steps for a 6-pipe asic, ignoring the potential for steps to be

mutually exclusive, is 91 with current code, therefore 100 is sufficient.