[nrfconnect] Remove CHIP_CONFIG_LAMBDA_EVENT_SIZE override

CHIP_CONFIG_LAMBDA_EVENT_SIZE should not be needed when building for
32-bit target.

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@nordicsemi.no>

Author: adigie

src/test_driver/nrfconnect/main/include/CHIPProjectConfig.h

@@ -33,7 +33,4 @@
 // Enable unit-test only features
 #define CONFIG_BUILD_FOR_HOST_UNIT_TEST 1
 
-// Increase max. lambda event size
-#define CHIP_CONFIG_LAMBDA_EVENT_SIZE 32
-
 #endif // CHIP_PROJECT_CONFIG_H