zephyr: Add requests module to vpython environment
zephyr: Add requests module to vpython environment

requests module is not natively available in recipes
environment. Add module support via vpython environment.

BUG=b:234676715
BRANCH=NONE
TEST=led get-build $ZEPHYR_EC_BUILD_ID > build.json
     led edit-recipe-bundle < build.json > edit.json
     vi edit.json // Add reference to this CL
     led launch < edit.json

Change-Id: I6b610265c476557174ba1e295ca292fb11854249
Signed-off-by: Al Semjonovs <c3a2ecb550cad1e7d5a943ca6241377f7b43ffc4@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3811789
Reviewed-by: Aaron Massey <79529a820df71f45023239a3663736629646cc34@google.com>
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec