Fix bootstrap on M1/M2 mac.

#28146 added bitarray to
requirements.bouffalolab.txt, but that package requires native compilation
during bootstrap.  And bootstrap ends up using the pigweed-provided clang for
that, but that clang is broken on M1/M2 mac.

For now, stop pulling requirements.bouffalolab.txt into the general
requirements.all.txt, so that bootstrap works for all the people not actively
developing for bouffalolab.  If it's re-added there later, it should be split up
to make sure the bitarray bits are not pulled in.

scripts/setup/requirements.all.txt

@@ -9,7 +9,6 @@ virtualenv
 -r requirements.esp32.txt
 
 -r requirements.mbed.txt
--r requirements.bouffalolab.txt
 -r requirements.openiotsdk.txt
 -r requirements.infineon.txt
 -r requirements.ti.txt