Revert "build_helper: Add toolchain file arg in nspe build command"

This reverts commit e696901fc8e6f67a5ca738bfeb2fb04c2358998c.

Reason for revert: nspe build command expects different toolchain file name. The `compiler` value set for spe build cannot be directly reused in nspe build

Change-Id: Id96eb3b1e2f58ee04077dd185879e1ca9b80f1b2
Signed-off-by: David Hu <david.hu@arm.com>
1 file changed