[M108 Migration][WRTjs] Use BUILDFLAG(IS_XXX) for OS checking

[M108 Migration][WRTjs] Use BUILDFLAG(IS_XXX) for OS checking

This patch replaces all occurances of defined(OS_XXX) with
BUILDFLAG(IS_XXX) as per upstream changes mentioned in [1].

[1] https://bugs.chromium.org/p/chromium/issues/detail?id=1234043

Below efl/tizen build flags are replaced:

USE_EFL -> IS_EFL
OS_TIZEN -> IS_TIZEN
OS_TIZEN_TV_PRODUCT -> IS_TIZEN_TV

Reference:
https://review.tizen.org/gerrit/#/c/platform/framework/web/chromium-efl/+/289238/

Change-Id: I387487f030919116dee9210261f23b215b6c4b60
Signed-off-by: zhaosy <shiyusy.zhao@samsung.com>