The angles are customizable in the developer options. Setting other values would probably require patching. Or telnet access and writing directly to /sys/devices/platform/soc/2100000.aips-bus/21a0000.i2c/i2c-0/0-001e/input/input2/tilt_angle* setting to 0 seems to disable rotation altogether, although I'm not familiar with gyro sensors so I can't really tell, what those values represent exactly.
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