[SWDEV-330460] Improve workaround for ConvAsmBwdWrw3x3 (#1618)
[SWDEV-330460] Improve workaround for ConvAsmBwdWrw3x3 (#1618)

Improvement of W/A introduced in #1616: this allows to enable ConvAsmBwdWrw3x3 explicitly by means of MIOPEN_DEBUG_CONV_DIRECT_ASM_WRW3X3. Might be useful for experimentation when developing the full-blown fix.
ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen