Revert of nanobench: turn on f16 and sRGB on the bots (patchset #1 id:1 of https://codereview.chromium.org/1769163006/ )

Reason for revert:
Debug bots failing at
   Running writepix_RGBA_UPM	f16

../../../src/core/SkBitmap.cpp:558: fatal error: ""false && \"Can't return addr for config\"""

Original issue's description:
> nanobench: turn on f16 and sRGB on the bots
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1769163006
>
> Committed: https://skia.googlesource.com/skia/+/6b5c5cc7b7bdffb4882706b915b544aba8714961

TBR=reed@google.com,mtklein@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1780463003

tools/nanobench_flags.json

@@ -16,8 +16,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "msaa4", 
     "nvprmsaa4", 
     "--match", 
@@ -61,8 +59,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "--match", 
     "~blurroundrect", 
     "~patch_grid", 
@@ -103,8 +99,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "msaa4", 
     "nvprmsaa4", 
     "--match", 
@@ -148,8 +142,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "--match", 
     "~blurroundrect", 
     "~patch_grid", 
@@ -187,8 +179,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "msaa16", 
     "nvprmsaa16", 
     "--match", 
@@ -209,8 +199,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "msaa16", 
     "nvprmsaa16", 
     "--loops", 
@@ -258,8 +246,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "msaa16", 
     "nvprmsaa16", 
     "--GPUbenchTileW", 
@@ -309,8 +295,6 @@
     "nonrendering", 
     "angle", 
     "hwui", 
-    "srgb", 
-    "f16", 
     "msaa16", 
     "nvprmsaa16", 
     "--match", 

tools/nanobench_flags.py

@@ -44,7 +44,6 @@ def get_args(bot):
 
   if 'Appurify' not in bot:
     config = ['565', '8888', 'gpu', 'nonrendering', 'angle', 'hwui']
-    config.extend(['srgb', 'f16'])
     # The S4 crashes and the NP produces a long error stream when we run with
     # MSAA.
     if ('GalaxyS4'    not in bot and