kconfig: tests: remove randconfig test for choice in choice

Nesting choice statements does not make any sense.

Commit df8df5e4 ("usb: get rid of 'choice' for legacy gadget
drivers") got rid of the only usecase.

I will turn it into a syntax error. Remove the test in advance.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/tests/rand_nested_choice/Kconfig

-# SPDX-License-Identifier: GPL-2.0
-
-choice
-	prompt "choice"
-
-config A
-	bool "A"
-
-config B
-	bool "B"
-
-if B
-choice
-	prompt "sub choice"
-
-config C
-	bool "C"
-
-config D
-	bool "D"
-
-if D
-choice
-	prompt "subsub choice"
-
-config E
-	bool "E"
-
-endchoice
-endif # D
-
-endchoice
-endif # B
-
-endchoice

scripts/kconfig/tests/rand_nested_choice/__init__.py

-# SPDX-License-Identifier: GPL-2.0
-"""
-Set random values recursively in nested choices.
-
-Kconfig can create a choice-in-choice structure by using 'if' statement.
-randconfig should correctly set random choice values.
-
-Related Linux commit: 3b9a19e08960e5cdad5253998637653e592a3c29
-"""
-
-
-def test(conf):
-    for i in range(20):
-        assert conf.randconfig() == 0
-        assert (conf.config_contains('expected_stdout0') or
-                conf.config_contains('expected_stdout1') or
-                conf.config_contains('expected_stdout2'))

scripts/kconfig/tests/rand_nested_choice/expected_stdout0

-CONFIG_A=y
-# CONFIG_B is not set

scripts/kconfig/tests/rand_nested_choice/expected_stdout1

-# CONFIG_A is not set
-CONFIG_B=y
-CONFIG_C=y
-# CONFIG_D is not set

scripts/kconfig/tests/rand_nested_choice/expected_stdout2

-# CONFIG_A is not set
-CONFIG_B=y
-# CONFIG_C is not set
-CONFIG_D=y
-CONFIG_E=y