drm/amd/display: Reduce number of arguments of dml31's CalculateWatermarksAndDRAMSpeedChangeSupport()

Most of the arguments are identical between the two call sites and they
can be accessed through the 'struct vba_vars_st' pointer. This reduces
the total amount of stack space that
dml31_ModeSupportAndSystemConfigurationFull() uses by 240 bytes with
LLVM 16 (2216 -> 1976), helping clear up the following clang warning:

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c:3908:6: error: stack frame size (2216) exceeds limit (2048) in 'dml31_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
  void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
      ^
  1 error generated.

Link: ClangBuiltLinux#1681
Reported-by: "Sudip Mukherjee (Codethink)" <[email protected]>
Tested-by: Maíra Canal <[email protected]>
Reviewed-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Nathan Chancellor <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: nathanchance