package/php-*: remove php dependency for php modules

package/php-*: remove php dependency for php modules

php modules can't be selected if the php package is not selected, see [1].
So adding the dependency is not necessary.
Also we don't add such dependencies for python modules.

[1] https://git.buildroot.net/buildroot/tree/package/Config.in?h=2019.11#n798

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Cc: Nicolas Carrier <nicolas.carrier@orolia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>